Refrigerant Circuit Layout - Lochinvar AMICUS HT Series Installation, Commissioning And Service Manual

4.24 Refrigerant circuit layout

4.24.1 Refrigerant circuit layout version P2U - P2S - single finned coil
Models 252-752
P2U Version
This is a two pipe version that can produce hot water for heating and cold water for cooling. The unit is used with
two pipe water based change-over systems. It is not able to produce domestic hot water.
P2S Version
This is a two pipe version that can, in addition to producing hot water for heating and cold water for cooling, also
generate domestic hot water. The controller has dual heating set points (heating and DHW) and can also control
a three port diverting valve that directs the DHW to the cylinder. DHW production has priority irrespective of the
mode of operation of the unit. The unit is normally used with two pipe water based change-over systems.
UT
BTI
BTO
SFW
The cooling circuit principle diagram is purely indicative.
BTI
User water input probe
BTO
User water output probe
CH
Charging plug
CHR
Charging plug
ECO
Economizer
EXV
Termostatic valve
FL
Liquid line filter
IV
Moisture indicator sight glass
LR
Liquid receiver
MC
Compressor
MFA
Source fan
MC
MC
YEC
YEC
EXV 1
VR
LR
SV
VR
CH
1
1
CHR ECO
FL
IV
MFC
SFW
SO
SV
UT
VR
VRV
YEC
36
NC NO
VRV
EXV 2
VR
EXV 4
Centrifugal fan
User flow switch
Source side
Shut off valve
User side
Check valve
Reverse cycle valve
By-pass solenoid valve
Refrigeration connections
Hydraulic connections
MFA
M
MFC
M
SO
Rev. A 11-2020